[Feature] Add Excel Loader to load .xlsx

[eren-darici]

Description

• Excel Loader created
• Dependencies added
• Basic tests are created

How Has This Been Tested?

• Created test_excel.py which includes multi-sheet validation.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have checked my code and corrected any misspellings

Maintainer Checklist

• [x] closes most issues related Excel
• [ ] Made sure Checks passed

[deven298]

LGTM!

@eren-darici Could you please resolve the conflicts? Also, it would be great it you can add docs for this here. I will merge this and release it in next package release.

[deshraj]

Seems like the PR has been inactive. Closing this now. Feel free to reopen if conflicts are resolved.